COMPARATIVE ENERGY COST ANALYSIS OF USING ABSORPTION CHILLER VERSUS MAGNETIC BEARING CENTRIFUGAL CHILLER IN PHILIPPINE SETTING

ENGR ROBERTO G. ROSALES, MSME

ASHRAE MEMBER, USGBC MEMBER BOMAP MEMBER

The objective of comparison are the following:

1. to find out at present if the use of absorption will merit with the current set-up of the facilities

2. to see the viability of use of absorption chiller versus magnetic bearing centrifugal chiller

3. to validate if electricity power is cheaper as compared to LPG power

Absorption chiller Centrifugal chiller – Magnetic Bearing

Annual Operating Cost for the Mallabsorption chiller magnetic bearing chiller

1. efficiency 0.269 kg/hr/ton 0.54 kw/ton2. installed capacity 5000 TR 5000 TR3. running loads 3000 TR 3000 TR4. gas requirements in kg(3000 TR loads) 808 -5. power consumption in kw( 3000TR loads) 16206. rate of LPG in pesos/kg 62.057. rate of power in pesos/kwhr 8.118. mall operating time per year, in hours 14,560 14,560

9. annual operating cost, pesos/year 729,622,764.16 191,292,192.00

Annual Operating Cost for the Hotelabsorption chiller magnetic bearing chiller

1. efficiency 0.269 kg/hr/ton 0.54 kw/ton2. installed capacity 1000 TR 1000 TR3. running loads at peak 750 TR 750 TR4. running loads at diversified 500 TR 500 TR5. gas requirements in kg(750 TR loads) 215 -6. gas requirements in kg(500 TR loads) 1347. power consumption in kw( 500 TR loads) 2708. power consumption in kw( 750 TR loads) 4059. rate of LPG in pesos/kg 62.0510. rate of power in pesos/kwhr 8.1111. hotel operating time per year at peak, in hours 5,824 5,824 12. hotel operating time per year at diversifed loads, in hours 2,912 2,912 13. annual operating cost at peak, pesos/year 77,683,888.93 12,752,812.80 14. annual operating cost at diversified load, pesos/year 24,231,671.78 9,564,609.60 15. total annual operating cost for hotel, pesos/year 101,915,560.71 22,317,422.40

Total ENERGY Cost for Central Plant- mall and hotel 831,538,324.87 213,609,614.40 Ratio of Energy Cost Absorption chiller over electric chiller 4LPG stock required for one week 13,325,934.693 kg/week

13,325.93 tons/weekCurrent Mall Tank Farm Storage 10,000kg

using 1000 TR Sanyo DE-63 model Absorption chiller using 500 TR Sanyo DE-42 model Absorption chiller

3,003.00 Mcal/h 1,496.00 Mcal/h

1,000.00 1,000.00

3,003,000.00 kcal/h 1,496,000.00 kcal/h

3.96 3.96

11,891,880.00 btu/h 5,924,160.00 btu/h

LPG Heating value (lower heating value) LPG Heating value

44,175.00 Btu/kg as per ISLA 44,175.00 Btu/kg as per ISLA

to get the hourly consumption of LPG to get the hourly consumption of LPG

divide the divide the

11,891,880.00 btu/h 5,924,160.00 btu/h

44,175.00 btu/kg 44,175.00 btu/kg

269 kg/hr gas consumption per hour for 1000 TR 134 kg/hr gas consumption per hour for 500 TR

0.269 kg/hr/ton 0.268 kg/hr/ton

using 800 TR Sanyo DE-61 model Absorption chiller

2,398.00 Mcal/h

1,000.00

2,398,000.00 kcal/h

3.96

9,496,080.00 btu/h

LPG Heating value

44,175.00 Btu/kg as per ISLA

to get the hourly consumption of LPG

divide the

9,496,080.00 btu/h

44,175.00 btu/kg

215 kg/hr gas consumption per hour for 800 TR

0.268706282 kg/hr/ton

RESULTS OF STUDIES

In the Philippine Setting and the current set-up of chiller facilities

1. Use magnetic bearing chiller is viable as compared to absorption chiller in Philippines setting

2. In the Philippines, electric energy is cheaper as compared to LPG or gas energy based on this comparative analysis

3. Annual energy cost of electric chiller is four times cheaper with absorption chiller in the Philippines

THANK YOU!